What are the best error handling practices when using SMSVerifier API for Telegram OTP?

The best error handling with SMSVerifier API for Telegram OTP involves validating inputs, managing rate limits with retries, handling timeouts, and monitoring for expired or failed OTPs to ensure seamless verification.

Common API Errors to Expect

When working with the SMSVerifier API for Telegram OTP, you will encounter several types of errors. Understanding these is the first step to robust error handling:

• Invalid API Key: Occurs if your API key is incorrect or revoked. The API returns an authentication error.
• Insufficient Balance: If your account balance is too low to purchase a phone number or receive an OTP.
• Invalid Service or Country Code: Using an unsupported service name or country code causes request rejection.
• Network Timeouts: Temporary network issues can cause request timeouts or incomplete responses.
• Expired OTP Requests: OTPs must be used within a limited time; expired requests return error codes indicating expiration.

Handling Rate Limits and Retries

SMSVerifier API enforces rate limits to maintain service quality. When you hit these limits, the API responds with specific error codes. To handle this gracefully:

• Implement exponential backoff on rate limit errors before retrying your requests. Start with a short delay and increase it exponentially.
• Use retry limits to avoid infinite loops—retry 3–5 times before failing definitively.
• Consider queueing requests client-side to smooth out bursts of OTP requests.

Timeout Strategies for Reliable Requests

Network conditions vary, so setting appropriate timeouts is crucial:

• Set your HTTP client timeout to between 15 and 30 seconds per request to balance responsiveness and network delays.
• If a timeout occurs, treat it as a transient failure and retry once or twice with backoff.
• Design your integration to not block user flows indefinitely—timeout and error responses should inform your UI quickly.

Managing Expired OTP Requests

OTP codes delivered via SMS are valid only for a limited period, typically 20 minutes. Your error handling should cover:

• Detecting expiration status using API response codes indicating the OTP request has expired.
• Prompting your users to request a new Telegram OTP if the previous one is no longer valid.
• Automatically cancelling or cleaning up expired OTP sessions in your backend to keep state consistent.

Refunds and Handling Failed Deliveries

One advantage of SMSVerifier API is its automatic refund policy for failed OTP deliveries:

• If no SMS arrives within the defined expiry window (usually 20 minutes), the API automatically refunds your account balance.
• Handle failure responses by retrying with a new number or informing your users of the delay.

Logging and Monitoring Best Practices

Robust error handling requires comprehensive logging and monitoring:

• Log all API errors with full response codes and messages for troubleshooting.
• Include request parameters like service name (telegram), country, and timestamps.
• Monitor key metrics such as failure rates, timeouts, and refund events to identify integration issues early.